NFPA 253: Standard Method of Test for Critical Radiant Flux of Floor Covering Systems Using a Radian

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Item #: NFPA_253
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2015 NFPA 253
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For the most accurate measurement of critical radiant flux, use the revised testing procedures outlined in NFPA 253.

Advance knowledge about how materials react to fire is critical to making informed selections. NFPA 253: Standard Method of Test for Critical Radiant Flux of Floor Covering Systems Using a Radiant Heat Energy Source is referenced by NFPA 101®: Life Safety Code® and building codes as the test procedure used to determine the critical radiant flux of a material. This test method is designed to provide a basis for estimating one aspect of the fire exposure behavior of a floor covering system installed in a building corridor or exitway.

Testing laboratories need to take note of a major change:

  • This edition includes an important clarification that airflow rates should be measured before igniting the panel.

Valuable Annexes discuss how to calibrate an apparatus, mounting methods, sample data logs, proper application and interpretation of results, specific safety precautions, and more. (Softbound, 18 pp., 2015)

NFPA® 253 Standard Method of Test for Critical Radiant Flux of Floor Covering Systems Using a Radiant Heat Energy Source 2015 Edition

Chapter 1 Administration
1.1 Scope
1.2 Purpose
1.3 Application
1.4 Summary of Test Method
Chapter 2 Referenced Publications
2.1 General
2.2 NFPA Publications. (Reserved)
2.3 Other Publications
2.4 References for Extracts in Mandatory Sections
Chapter 3 Definitions
3.1 General
3.2 NFPA Official Definitions
3.3 General Definitions
Chapter 4 Test Apparatus
4.1 Radiant Panel Test Apparatus
4.2 Test Chamber
4.3 Radiant Heat Energy Source
4.4 Specimen Holder
4.5 Pilot Burner
4.6 Thermocouples
4.7 Exhaust Hood
4.8 Dummy Specimen
4.9 Timer
Chapter 5 Test Specimens
5.1 Sampling Procedure
5.2 Specimen Size and Mounting
5.3 Specimen Conditioning
Chapter 6 Radiant Heat Energy Flux Profile Standardization
6.1 Procedure
Chapter 7 Test Procedure
7.1 Pretest Heating
7.2 Sample Mounting
7.3 Ignition of Pilot Burner
7.4 Flame Propagation of Specimen
7.5 Completion of Test
7.6 Data Collection and Recording
7.7 Removal of Specimen
7.8 Subsequent Testing
7.9 Extent of Flame Travel After a Prescribed Period
Chapter 8 Calculations
8.1 General
8.2 Formulas
Chapter 9 Report
9.1 Required Information
Annex A Explanatory Material
Annex B Procedure for Calibration of Apparatus
Annex C Sample Data Logs
Annex D Commentary on Critical Radiant Flux Test
Annex E Precision and Bias
Annex F Safety Precautions
Annex G Informational References
Index